Speed Supervision - Siemens LMV36.520A1 Basic Documentation

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Building Technologies Division
Infrastructure & Citiies Sector

13.9 Speed supervision

The fan's current speed is acquired by the LMV36... and assessed from a safety point of
view. If the fan does not operate at the speed setpoint, speed control makes a corrective
action, trying to reach the setpoint. If it is not reached within a certain period of time,
safety shutdown is initiated. To ensure a high level of availability and safety, a number
of monitoring bands with different response times are defined.
It is possible to switch off speed supervision at standstill (no-load speed 0%) in standby
mode. This may be necessary if the fan rotates too much in standby mode due to a
chimney draft or if an extended ramp time is active with a PWM fan during the transition
from the postpurge speed to standstill.
No. Parameter
653 VSD standstill supervision in standby mode
0 = deactivate
1 = active
Speed deviation in % points
0...0.5%
0.6...2%
2.1...10%
>10%
Error Diagnostic
code code
83 Bit 0
Valency 1
Bit 1
Valency 2...3
Bit 2
Valency 4...7
Bit 3
Valency 8
Bit 4
Valency 16
Bit 5
Valency 32
Basic documentation LMV36...
13 Fan control
Shutdown time
Speed reached  no shutdown
<8 s
<3 s
<1 s
Meaning for the LMV36... system
Lower control range limitation of control
Upper control range limitation of control
Interruption via disturbance pulses
Curve too steep in terms of ramp speed
Interruption of speed signal
Quick shutdown due to excessive speed deviation
CC1P7544en
25.09.2013